关于声音的下列说法中正确的是 A.声音是由物体振动产生的b.音调由振幅决定振幅越大音调越高c.物体振动的次数叫�率d.声强级为0db Template




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tomski关于声音的下列说法中正确的是 a.声音是由物体振动产生的b.音调由振幅决定振幅越大音调越高c.物体振动的次数叫�率d.声强级为0db coloring